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状态模式 (State Pattern)

The State Pattern is a behavioral design pattern that allows an object to alter its behavior when its internal state changes^[600-developer__23种设计模式.md]. The object will appear to change its class^[600-developer__23种设计模式.md].

Overview

This pattern is categorized among the Behavioral Design Patterns^[600-developer__23种设计模式.md]. It addresses the need to manage complex state-dependent logic by encapsulating state-specific behaviors within separate state objects^[600-developer__23种设计模式.md]. Instead of relying on complex conditional statements (such as large switch or if-else blocks) to determine behavior based on state, the pattern delegates state-specific logic to these objects.

Key Characteristics

  • Behavioral Modulation: The primary feature of the State Pattern is that an object's behavior is determined by its current state^[600-developer__23种设计模式.md].
  • Dynamic Transition: The object can dynamically switch between states at runtime, which alters how it responds to requests^[600-developer__23种设计模式.md].
  • Encapsulation: State-specific logic is encapsulated, making it easier to add new states without modifying existing context objects^[600-developer__23种设计模式.md].

Sources

  • 600-developer__23种设计模式.md